A small update. My apologizes for not having much to share lately. I recently took on a part time job (30-40 hrs a week on top of my normal 9-5 engineering job ) with a local gun parts wholesaler, so my evenings have been spent putting together 100's of 5.56 and 7.62 BCG's. This evening for example, I put together ~400 5.56 AR bolts.

On the project side of things, I gave the nice folks at Clark Custom Guns a call earlier in the week because I had heard they are a good source of take off Ruger MK barrels. They managed to have one 5.5 stainless bull barrel on the shelf and are going to call me as more come in. The thought is that I'll machine 5 receivers and barrel them with factory barrels, then use them for my barrel length testing to speed things up a bit and to dial in my receiver specs.

The barrel ran me $85 plus $5 shipping

It's kind of interesting that the feed ramp is part of the barrel.

You can see that the barrel does go a decent way back into the receiver. I'm sure when I get around to installing it, it's going to take some work to get to clocked correctly, so when it's threaded in, the feed ramp is at the 6 o'clock position.